KSME International Journal

, Volume 18, Issue 11, pp 1932–1940 | Cite as

Development of the delamination evaluation parameters (I) — the delamination aspect ratio and the delamination shape factors —

  • Cheol-Woong Kim
  • Sam-Hong Song
  • Dong-Joon Oh


Although the previous researches evaluated the fatigue behavior of A1/GFRP laminates using the traditional fracture mechanism, their researches were not sufficient to do it : the damage zone of A1/GFRP laminates was occurred at the delamination zone instead of the crack-metallic damages. Thus, previous researches were not applicable to the fatigue behavior of Al/GFRP laminates. The major purpose of this study was to evaluate delamination behavior using the relationship between crack length(a) and delamination width(b) in A1/GFRP laminate. The details of investigation were as follows : 1) Relationship between the crack length(a) and the delamination width(b), 2) Relationship between the delamination aspect ratio(b/a) and the delamination area rate ( (Ad)n/ (A d ) all) , 3) The effect of delamination aspect ratio(b/a) on the delamination shape factor (f s ) and the delamination growth rate (dA d /da). As results, it was known that the delamination aspect ratio(b/a) was decreased and the delamination area rate ( (A d ) n / (A d ) All ) was increased as the normalized crack size(a/W) was increased. And, the delamination shape factors (f s ) of the ellipse-II (f s3 ) was greater than of the ellipse-1 (f s2 ) but that of the triangle (fs1) was less than of the ellipse-I (f s2 ).

Key Words

Delamination Width(b) Delamination Aspect Ratio(b/a) Delamination Shape Factor (fsDelamination Growth Rate (dAd/daDelamination Area Rate ((Ad)n/(Ad)allA1/GFRP Laminates Cyclic Bending Moment 


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  1. Guo, Y. J. and Wu, X. R., 1999, “Bridging Stress Distribution in Center-Cracked Fiber Reinforced Metal Laminates: Modeling and Experiment,”Engineering Fracture Mechanics, Vol. 63, pp. 147–163.CrossRefGoogle Scholar
  2. Jin Zhi-He and Mai Yiu-Wing, 1997, “Residual Strength of an ARALL Laminate Containing a Crack,”Journal of Composite Materials, Vol. 31, No. 8, pp. 746–761.Google Scholar
  3. Roebroeks, G. H. J. J., 1987, “Constant Amplitude Fatigue of ARALL-2 Laminates,”Report LR-539, Department of Aerospace Engineering, Delft University of Technology, Netherlands.Google Scholar
  4. Song Sam-Hong and Kim Cheol-Woong, 2001, “The Delamination and Fatigue Crack Propagation Behavior in A15052/AFRP Laminates Under Cyclic Bending Moment,”Transaction of the KSME, A, Vol. 25, No. 8, pp. 1277–1286.Google Scholar
  5. Song Sam-Hong and Kim Cheol-Woong, 2003, “Fatigue Crack and Delamination Behavior in the Composite Material Containing a Saw-cut and Circular Hole (I) — Aramid Fiber Reinforced Metal Laminates,”Transactions of the KSME, A. Vol. 27, No. 1, pp. 58–65.Google Scholar
  6. Song Sam-Hong and Kim Cheol-Woong, 2003, “The Analysis of Fatigue Behavior Using the Delamination Growth Rate (dA d/da) and Fiber Bridging Effect Factor (F be) in Al/GFRP Laminates,”Transactions of the KSME, A, Vol. 27, No. 2, pp. 317–326.Google Scholar
  7. Song Sam-Hong and Kim Cheol-Woong, 2003, “Analysis of Delamination Behavior on the Stacking Sequence of Prosthetic Foot Keel in Glass Fiber Reinforced Laminates,”Transactions of the KSME, A, Vol. 27, No. 4, pp. 623–631.Google Scholar
  8. Yoon, H. K., Cheng, H. Y., Park, W. J. and Hue, C. W., 1995, “The Behavior of Crack Growth Rate for APAL and CPAL Patched with FRP Laminate in Aluminum Alloy Plate,”Transactions of the KSME, A, Vol. 19, No. 4, pp. 253–262.Google Scholar

Copyright information

© The Korean Society of Mechanical Engineers (KSME) 2004

Authors and Affiliations

  1. 1.Research Institute of Engineering & TechnologyKorea UniversitySeoulKorea
  2. 2.Department of Mechanical EngineeringKorea UniversitySeoulKorea
  3. 3.Department of Mechanical EducationAndong National UniversityKyoungbukKorea

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